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Well, I'm only a few kilometers from the covered area. On my old phone, I can see the map if I move there.
On my new phone, I can see two errors:
- Map of this area is not available
- Unknown problem (I didn't see that yesterday, probably I was in the covered area).

I attached screenshots from both phones.

Thank you.
I'm sure that both conditions are met.
1. I have just checked again, and there are both files (.info and .sqlitedb). Beside them, one more file appeared (.sqlitedb-journal).
2. I'm logged in with the same username as years ago. It is my only password for Locus map stored in a password manager, and I can log in on my new phone.

Years ago, I bought two maps for hiking. If I remember right, I made a backup of it. I have two files - .info and .sqlitedb for that map.
On my new phone, I installed Locus Map and imported the file from Android\media\menion.android.locus\maps. The import process asks me to confirm the name. After that, the name was listed in Offline tab (Maps).
I restarted the app and then selected the map. I can see blank with "Map of this area is not available". What can be wrong? I move up, down, and check distances from the current point, so I'm sure of the covered area. It didn't help.
UPDATE: I can't remember when I bought the map, but it was years ago. Were there any changes that can affect this?
I tried to download the same map again from the store, but it wants me to pay again.

Thank you. I will try this the next time.

I'm a Locus Map noob. I searched but didn't find an answer.

What would I like to achieve?
Import a GPX route in Locus and follow the route. I found how to import, but how can I then follow the route?